After listening to the Blancolirio audio it's seems to me very clear what happened.
A lack of a pre-defined briefing which all pilots adhere to, without deviation. An overloaded Airboss that positioned aircraft into a conflict.
I haven't listened on my airband radio at a UK airshow for a few years now but when I did the airwaves during a display were very quiet and limited to display leaders giving instructions to their team and occasionally ATC.
The audio for this show sounded confused.